Contents
Which counter counts from 0 to 9?
Similarly, the BCD counter is a Mod-10 counter, which resets to zero after counting from 0(0000) to 9 (1001), represents the result in decimal form. (that means divide-by-10 count). Hence, it is called a binary coded decimal counter (BCD Counter).
What is counter design a modulo 9 counter?
Design a synchronous Modulo-9 (Mod-9) counter using toggle Flip-Flops (T Flip-Flop). The counter will be clocked on the rising edge of the clock signal, and count will be cleared using an active-low, asynchronous clear signal. Implement the clear signal using the smallest circuit possible.
How do you find the modulo of a counter?
The modulus of a counter is given as: 2n where n = number of flip-flops. So a 3 flip-flop counter will have a maximum count of 23 = 8 counting states and would be called a MOD-8 counter. The maximum binary number that can be counted by the counter is 2n–1 giving a maximum count of (111)2 = 23–1 = 710.
What does mod 9 mean?
Modular 9 arithmetic is the arithmetic of the remainders after division by 9. For example, the remainder for 12 after division by 9 is 3.
How is counter value calculated?
The obvious method is to feed the measurement signal into a counter chip which is turned on for a set period e.g. 1 second. The counter value is actually the frequency measurement since: f = events/time = counter value/1 second = counter value in Hz.
What is a 4-bit counter?
The SN74HC163 is a 4-bit binary counter. This mode of operation eliminates the output counting spikes normally associated with synchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of the clock waveform.
When to reset a JK binary counter from 0 to 9?
When both bits are one, and that only occurs when the output is 10 if you stay in the 0..9 range, the NAND output goes low and pulls low all the negative reset inputs of the FFs, resetting your counter. When you want to design a counter which counts 0000-1001 (0 to 9), You have to reset when it reaches 1010 (10).
When do you reset the counter from 0 to 9?
When you want to design a counter which counts 0000-1001 (0 to 9), You have to reset when it reaches 1010 (10). If you reset it when it is 9 (1001), then you wont be able to see the count 9 ( of course there will be a glitch of 9 but it will stay only for a very small time )
How to change up counter to count down?
To convert the up counter in Fig. 5.6.1 to count DOWN instead, is simply a matter of modifying the connections between the flip-flops. By taking both the output lines and the CK pulse for the next flip-flop in sequence from the Q output as shown in Fig. 5.6.3, a positive edge triggered counter will count down from 1111 2 to 0000 2.
How is one input used to make one counter count?
Fig. 5.6.10 illustrates how a single input, called (UP/ DOWN) can be used to make a single counter count either up or down, depending on the logic state at the UP/ DOWN input.